CCNA EIGRP LAB Question
Question
After adding R3 router, no routing updates are being exchanged between R3 and the new location. All other inter connectivity and Internet access for the existing locations of the company are working properly.
The task is to identify the fault(s) and correct the router configuration to provide full connectivity between the routers.
Access to the router CLI can be gained by clicking on the appropriate host. All passwords on all routers are cisco.
IP addresses are listed in the chart below.
| R1 Fa0/0: 192.168.77.33 S1/0: 198.0.18.6 S0/1: 192.168.60.25 S0/0: 192.168.36.13 |
R2 Fa0/0: 192.168.60.97 Fa0/1: 192.168.60.113 S0/0: 192.168.36.14 |
| R3 Fa0/0: 192.168.77.34 Fa0/1: 192.168.60.65 Fa1/0: 192.168.60.81 |
R4 Fa0/0: 192.168.60.129 Fa0/1: 192.168.60.145 S0/1: 192.168.60.26 |
Answer and explanation
(Note: If you are not sure how EIGRP works, please read my EIGRP tutorial: http://www.9tut.com/eigrp-routing-protocol-tutorial. Note: You can download this sim to practice here: http://www.9tut.com/download/9tut.com_CCNA_EIGRP_sim_question.zip)
We should check the configuration of the new added router first because it does not function properly while others work well. From the command line interface of R3 router, enter the show running-config command
From the output above, we know that this router was wrongly configured with an autonomous number (AS) of 22. When the AS numbers among routers are mismatched, no adjacency is formed.
(You should check the AS numbers on other routers for sure)
To solve this problem, we simply re-configure router R3 with the following commands:
R3>enable (you have to enter cisco as its password here)
R3#configure terminal
R3(config)#no router eigrp 22
R3(config)#router eigrp 212
R3(config-router)#network 192.168.60.0
R3(config-router)#network 192.168.77.0
R3(config-router)#no auto-summary
R3(config-router)#end
R3#copy running-config startup-config
Check R1 router with the show running-config command:
Notice that it is missing a definition to the network R3. Therefore we have to add it so that it can recognize R3 router
R1>enable (you have to enter cisco as its password here)
R1#configure terminal
R1(config)#router eigrp 212
R1(config-router)#network 192.168.77.0
R1(config-router)#end
R1#copy running-config startup-config
Now the whole network will work well. You should check again with ping command from router R3 to other routers!
Modifications:
Maybe in this EIGRP Sim you will see the “passive-interface …” command somewhere in R1 configuration. If the link between R1 to R2; or R1 to R3; or R1 to R4) routers has the “passive interface” then we have to remove it with the “no passive-interface …” command because it prevents EIGRP update from being sent on that interface. But if the “passive interface” is applied to the link between R1 and ISP router like this:
R1:
!
router eigrp 212
passive-interface s1/0
!
then we just leave it. Don’t use the “no passive-interface s1/0″ on R1 because the link between R1 & ISP doesn’t need EIGRP to run on it. A static route from R1 to ISP & “ip default-network” command in R1 are correct so that all the routers (R1, R2, R3, R4) can access the Internet.
(Note: The “ip default-network” command in R1 will advertise the static route of R1 (to go to the Internet) to other routers (R2,R3,R4) so that they can access the Internet too). In the exam you will see these lines in R1 configuration:
!
ip default-network 198.0.18.0
ip route 0.0.0.0 0.0.0.0 198.0.18.5
!
If you want to learn more about “ip default-network” command please read: http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a0080094374.shtml
I read recent comments and realized that you will see the “passive-interface” in the link between R1 & ISP router so just leave it.
Note: Also some readers confuse about if we should use the wildcard masks on the “network” statements under EIGRP process or not. For example should we use:
router eigrp 212
network 192.168.77.0 0.0.0.3
The answer is: we can use wildcard masks or not, it does not matter. Not having a wildcard mask does not make the routes conflicting. The “network …” command in EIGRP (and OSPF, RIP) does not means “advertise this network” but means “If I has interface(s) belongs to this network please turn on EIGRP on that interface. Therefore when you don’t use wildcard mask EIGRP will turn on EIGRP on all interfaces that belongs to the network you specify in the “network …” command.
You should only use wildcard mask on EIGRP if you have 2 or more interfaces that belong to the same major networks but you don’t want to run EIGRP on all of them. For example if your router has 2 interfaces whose IP addresses are 192.168.30.1/28 and 192.168.30.17/28 but you only want to run EIGRP on the first interface, you can type “network 192.168.30.0 0.0.0.15″ under EIGRP process.
Other lab-sims on this site:
CCNA Configuration SIM Question (RIPv2 SIM)
I passed today.
Lab in Today Exam..
I passed today.
Lab in Today Exam..
@koncave you use the passive-interface when the interface is not part of the route to another router, eg network lan
@estefano thanks and last question should i enter the no passive-interface inside the eigrp AS or you can enter it in global config?
akshima I need ur help….ths s ma email id- hazzaryag4@gmail.com
guys a very quick question, has anyone taken the CCNA for the second time? if you did, can you please tell me which lab you did in you exam. Any one has any idea. I read somewhere that the second time they change the questions and labs. Can any help please.
Thank you.
@koncave you need configure the passive-interface in eigrp declaration .
Eg: serial network 172.16.0.0 , seria network 179.16.0.0 and lan network 192.168.10.0 .
The lan network not send updates to eigrp routes .
R2#conf t
R2(config)#router eigrp 100
R2(config-router)#network 172.16.0.0
R2(config-router)#network 179.16.0.0
R2(config-router)#network 192.168.10.0 ———->>> LAN
R2(config-router)#no passive-interface f0/1——–>>> LAN
I hope I have helped, good studies .
hi,
guys, please help. Question about on “no auto summary” command could be indicate the command or no need ?
i did the cconfiguration as mintioned but ican’t make ping
any Help!!
Just passed today 1000/1000.
ACL 1, ACL 2 (Mod 3, different IP Address) and EIGRP Lab (AS no. 23, on R1 did not remove passive-interface s1/0 because it is connected to ISP, on R1 removed one EIGRP network 192.x.x.0 because there is no connected interface, on R1 did not remove “ip default-network 198.0.18.0″ “ip route 0.0.0.0 0.0.0.0 198.0.18.5″ so routers can connect to internet.
@test “no auto-summary ” is indicate if you have subnets . You can use the wildmask for separate the networks or use the command “no auto-summary”
@tom , you had verify the ip address , the apk is different ip address
eigrp lap today in my exam. Passed today
Anyone tell me why we use “no passive interface”command.
Answer me fast.
Answer you fast huh?
Passive interfaces are usually used for security or when you don’t want a certain network to be advertized via EIGRP (or with whatever routing protocol you’re using). Why for security? Well, if you have a interface that isn’t passive (connected to a switch with end users) one of your end users can start advertising (in a malicious way) false routes there by poisoning your network and causing a potential outage.
Had exam today 986/1000 thanks 9tut
acl 1 2 and eigrp
how are you able to identify network for each router?
passed today 23/dec/2014 with 903/1000
i got eigrp 122
acl 1 and 2(mod 3 different ips)
thank u 9tut
acl2 mod 4 (from host d) eigrp lab (as 12) mean?
passed 937/1000
eigrp,acl 1&2
thanks to 9tut
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help plzz everyone talks about eigrp lab as 112 , eigrp as 22 , eigrp as 222 and eigrp as 23 im so confused i cant find them here . only eigrp as 212 and eigrp as 1 is here in simulation section anybody can explain me ?
EIGRP LAB question was in 28-12-2014 exam + ACL 1+ ACL2, everything is within dumps and 9tut….thanks a lot especially for explanations which rectified many misunderstood theories ;)…BTW scored 972/1000.
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Got the ccna today. Eigrp,acl1 and1. All questions from 9tut. Thanks9tut
The function of Passive interface is to not allow hello packets to transmit on a certain interface but allows you to advertise that network.
I passed today 972/1000 . Eigrp, acl1 & acl 2. Thanx 9tut.
I passed todat 1000/1000. Eigrp acl1 & acl2 (mode3). Thanks 9tut. Every queastion is here :)
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